Hydrolevel 500 Low Water Cut-Off Refrigerant The MARS 39220 Limit Switch

The MARS 39220 Limit Switch is a versatile

2" WC step opening to prevent hard ignitions and ensure consistent burner performance

high-precision solution for room temperature monitoring

eliminating field modification during installation

Hydrolevel 500 Low Water Cut-Off Refrigerant The MARS 39220 Limit SwitchThe Hydrolevel 500 Low Water Cut Off is a professional grade safety control engineered for hot water boilers in both residential and commercial applications. Operating on 24VAC, this electronic LWCO utilizes a probe to monitor water conductivity, effectively preventing dry firing and mechanical failure. Unlike mechanical float switches, this solid state control features no moving parts, eliminating the need for periodic blowdowns. The unit is equipped